it's what makes a subaru, a subaru. >> from boston to big sur a link that ties monday boston marathon to the big sur marathon which take thes place in 10 daytime. along highway 1 between big sur and carmel organizers were in boston when the explosions happened. and as david explains, they are now preparing to beef up security. >>reporter: 400 runners in the boston marathon elite group that do back-to-back 22.6 mile races. week from sunday running the big sur international marathon. big sur race director thurston near the finish lane when the devic devices exploded. >> knowing where it was. w many people were there and how crowdeded the area was, it was kind of immediate gut check reaction that this is not good. >>reporter: the tragedy could have caused boston run investigators kaenls the big sur plans but that hasn't happened. >> more determination than ever because there are many people who are part of this special group of people, 400 entrant part of the boston to beg sur challenge. more determination than ever to come to big sur and finish the race. >> securoÑ will be wristed. hig